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narran srarns BENJN. YV. HENDRICK AND H. HENDRICK, OF PRCVIDENGE, RHODE ISLAND.

WEAVINGr-LOOM.

Speccaton of Letters Patent No. 2,616, dated May 12, 1842.

To aZZwwm t may concern: Be it known that we, BENJAMIN W. HEN- Dmon and HORACE HENDIuoK, of the city of Providence, in the county of Providence and State of Rhode Island, have invented certain Improvements in Power Looms, by means of which the letoff and takeeup motions are governed in a manner more advantageous than has heretofore been done, and by which also the cloth-beam is made` to yield to the varying tension of the threads const-ituting the warp, which varying tension results from the working of the harness; and we do hereby declare that the following is a full and exact description thereof.

In the accompanying dra-wings we have represented the manner in which we arrange our apparatus, under two different modifications thereof, the two, however, being substantially the same in their general arrangement and action and the change in their form being such only as is necessary to adapt the improvement to the difference in the framework of looms already made.

Figure l, is one end of a loom, as it would be seen in a vertical section from front to back, made at the distance of a few inches from the end frame, and looking at it from the interior. A, A, is the end frame; B, the yarn beam, and C, the cloth beam. D, is a shaft leading from the yarn beam to the cloth beam, and having a worm wheel, or endless screw, at each end of it. The endless screw E, gears into the toothed wheel F, on the end of the yarn beam, on its underside, and the endless screw, or worm wheel, G, at the opposite end gears into the upper side of the toothed wheel H, on the cloth beam. The worm, or screw, E, is firmly attached to the shaft D, but the worm wheel G, is tubular, so that it can turn, or play, back and forth, upon the shaft D. It has attached to it a clutch, or coupling, wheel I, the teeth of which lit into those of a correspending clutch wheel J, made fast to the shaft D. Upon this shaft there is a spiral spring K, by which the clutch wheels are kept in contact with each other when not subjected to a force which would overcome this tension of the spring.

The screw E, is single threaded and the screw G double threaded; and supposing the wheel F, to be double the diameter of the wheel H, the latter would make four revolutions while the former made one, when the shaft D, was made to revolve; they may, of

course, be so varied in diameter as to cause their motions to correspond with the relative diameters of the yarn and` cloth beams, whatever these may be.

In` the working of the harness up and down, the tension given to the threads constituting the warp is constantly varying, and under the ordinary modes of construct-- ing looms this is productive of much inconvenience and` injury, which are completely obviated by the novel mode of arranging the parts as above described. As the warp is strained by the motion of the harness up and down, the cloth beam yields to the force thereby exerted upon it; the teeth of the wheel H, acting upon the `worm wheel G, forces it against the spring K, which, yielding, allows the cloth beam to revolve to the required distance, while it is caused to return when the tension is taken olf. The teeth of the clutch wheels thus slide upon each other as the harness plays up and down, and when the tension becomes sulficient to force the worm G, back to a sulficientdistance, the clutch wheel I, will escape a single tooth, and thus keep the action equal.

The worm wheels, or endless screws, E, and G, are one right, and t-he other left, handed, and this constitutes an important item in our improvements, as by this device the yarn and cloth beams are made to counteract the tendency of each other to turn, from the tension of the warp, and we are in consequence thereof enabled to dispense with the vertical shaft ratchet wheel, and friction strap, ordinarily used to regulate the connection between the two beams; an arrangement which is not only more compleX, but is also less efficient than that adopted by us.

The arrangement for giving to the cloth beam its take up motion differs, in some particulars, from that in ordinary use. The back lever L, on the lathe, is the same with that on other looms, but it is made to act directly on the shaft D, through the intermedium of the ratchet wheel M, and the pawl, or feed hand, N. The back lever L, gives motion to the kneed lever O, having the pawl N, at its upper end, and this carries the shaft D, to the required distance at every beat of the lathe.

Fig. 2, shows the manner in which we, sometimes, adapt our apparatus to the framework of the loom, and is a sectional view,

Vtaken in the same manner with Fig. 1. In

structed and operating as above described.

The ratchet wheel M, is placed upon the lower end of the shaft D, and the lever O, is so formed as toV act upon the pawl N, in

its proper position.

Having thus fully described the nature of Vour improvements,'and shown the manner in which we carry the same into operation,

what we claim therein as new, and desire to secure by Letters Patent, is*

V1. The manner in which we have combined the two worm Wheels with the yarn and the cloth beams; one of said wheels having a right-handed, and the other a lefthanded thread, so as to cause them, by their counteraction, to preserve the two beams in their required relative positions, without the aid of a friction band, or of any analogous device.

2. We claim, likewise, the manner in which we have arranged and combined the worm wheel G, the shaft D, the spiral spring L, the clutch wheels I, and J, andthe cloth beam, so as to admit of the yielding of the latterV with the varying tension of the warp.

BENJAMIN WV. HENDRICK. HORACE HENDRICK.

Witnesses:

. JOSEPH T. BARBER, JOSEPH B. POTTER.,

SOv 

